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There has been much debate whether GSIM should make a differentiation between unit data and dimensional data. For GSIM v1.0, it was decided that the distinction was retained. There were two reasons for this:

The distinction is important enough distinction to National Statistical Offices that it should be retained in the model.

The proposals for how to change the model were thought to be too big a change to take on in the timeframe available.

Here are some the relevant proposals and reviews that have been received on the topic.